Optically addressable nuclear spins in a solid with a six-hour coherence time

By Manjin Zhong, M. Hedges, R. Ahlefeldt, J. Bartholomew, S. Beavan, Sven M. Wittig, J. Longdell, Matthew J. Sellars. Nature, 2015

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Quantum memories: emerging applications and recent advances (2015, methodology): “tionary optical pumping technique and an improved dynamical decoupling method were employed to extend EIT storage time in the same crystal up to one minute. The highly in uential work of Zhong et al. [61] led to a recent breakthrough in extending the coherence time of ground-state hyperne transition”
Photonic quantum information processing: A concise review (2019, background): “…but not limited to broadband, 187,188 high-speed, 189 multi-mode, 79,190 telecom-compatible, 51,191 or conﬁgurable 192 memories, capable of storing vector, 193 vortex-, 194 or entangled-51,190 qubits, and storage with long coherence times 195 and high storage efﬁciency 196–198 and ﬁdelity.”
Coherence time of over a second in a telecom-compatible quantum memory storage material (2016, methodology): “Crystals doped with either praseodymium or europium have demonstrated storage on long lived spin states [15–17], multimode storage [15, 18], large efficiencies [19, 20] and hyperfine coherence times of 6 hours using the Zero First Order Zeeman (ZEFOZ) technique [21].”
Materials challenges and opportunities for quantum computing hardware (2021, background): “Defects in other material systemssuch as the T center in Si ( 216 )andrare-earth ions insolidstatecrystals ( 217 – 219 ) are also being explored.”